The issues you are having are a very common experience for young(ish) men today, in fact I'd go as far to say that this is the norm. You are living in a time with a dating culture that has been completely warped by social media and dating apps. A young woman today could have access to more potential suitors in one week than a woman from previous generations would have had in an entire lifetime. This was a hard reality for me to accept a few years ago, but a woman that you are talking to is very likely in contact with at least a few men that are comparable to you or possibly better than you.
Women are also far more readily eager to next men instead of giving them a 2nd date, which is a result of the sheer (over)abundance they have with their options of male suitors. Maybe she likes guys that are 6'+ and fit, but you have a sense of humor she doesn't understand or she doesn't like the way you chew your food lol. Again, women today are far fussier than what you would have seen with previous generations of women.
This says a lot about our current times when many young men compare getting a decent girlfriend to that of winning the lottery. This is something I've seen a lot of online but I've also been noticing it in the real world, especially over the last couple years. This isn't some isolated issue unique to black pillers, incel communities, etc. but is instead something affecting the broader male population. I've said this before and I'll say it again, the overwhelming majority of baby boomer males that got married and had children would be total incels in today's dating market.
Keep your head up but try not to obsess over something like this, it's not healthy.